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226 lines (194 loc) · 5.83 KB
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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"context"
"encoding/json"
"errors"
"fmt"
"path"
"sort"
"strings"
jsoniter "github.com/json-iterator/go"
"github.com/minio/madmin-go/v3"
"github.com/minio/minio/internal/config"
"github.com/minio/minio/internal/kms"
)
const (
minioConfigPrefix = "config"
minioConfigBucket = minioMetaBucket + SlashSeparator + minioConfigPrefix
kvPrefix = ".kv"
// Captures all the previous SetKV operations and allows rollback.
minioConfigHistoryPrefix = minioConfigPrefix + "/history"
// MinIO configuration file.
minioConfigFile = "config.json"
)
func listServerConfigHistory(ctx context.Context, objAPI ObjectLayer, withData bool, count int) (
[]madmin.ConfigHistoryEntry, error,
) {
var configHistory []madmin.ConfigHistoryEntry
// List all kvs
marker := ""
for {
res, err := objAPI.ListObjects(ctx, minioMetaBucket, minioConfigHistoryPrefix, marker, "", maxObjectList)
if err != nil {
return nil, err
}
for _, obj := range res.Objects {
cfgEntry := madmin.ConfigHistoryEntry{
RestoreID: strings.TrimSuffix(path.Base(obj.Name), kvPrefix),
CreateTime: obj.ModTime, // ModTime is createTime for config history entries.
}
if withData {
data, err := readConfig(ctx, objAPI, obj.Name)
if err != nil {
// ignore history file if not readable.
continue
}
data, err = decryptData(data, obj.Name)
if err != nil {
// ignore history file that cannot be loaded.
continue
}
cfgEntry.Data = string(data)
}
configHistory = append(configHistory, cfgEntry)
count--
if count == 0 {
break
}
}
if !res.IsTruncated {
// We are done here
break
}
marker = res.NextMarker
}
sort.Slice(configHistory, func(i, j int) bool {
return configHistory[i].CreateTime.Before(configHistory[j].CreateTime)
})
return configHistory, nil
}
func delServerConfigHistory(ctx context.Context, objAPI ObjectLayer, uuidKV string) error {
historyFile := pathJoin(minioConfigHistoryPrefix, uuidKV+kvPrefix)
_, err := objAPI.DeleteObject(ctx, minioMetaBucket, historyFile, ObjectOptions{
DeletePrefix: true,
})
return err
}
func readServerConfigHistory(ctx context.Context, objAPI ObjectLayer, uuidKV string) ([]byte, error) {
historyFile := pathJoin(minioConfigHistoryPrefix, uuidKV+kvPrefix)
data, err := readConfig(ctx, objAPI, historyFile)
if err != nil {
return nil, err
}
return decryptData(data, historyFile)
}
func saveServerConfigHistory(ctx context.Context, objAPI ObjectLayer, kv []byte) error {
uuidKV := mustGetUUID() + kvPrefix
historyFile := pathJoin(minioConfigHistoryPrefix, uuidKV)
if GlobalKMS != nil {
var err error
kv, err = config.EncryptBytes(GlobalKMS, kv, kms.Context{
minioMetaBucket: path.Join(minioMetaBucket, historyFile),
})
if err != nil {
return err
}
}
return saveConfig(ctx, objAPI, historyFile, kv)
}
func saveServerConfig(ctx context.Context, objAPI ObjectLayer, cfg interface{}) error {
data, err := json.Marshal(cfg)
if err != nil {
return err
}
configFile := path.Join(minioConfigPrefix, minioConfigFile)
if GlobalKMS != nil {
data, err = config.EncryptBytes(GlobalKMS, data, kms.Context{
minioMetaBucket: path.Join(minioMetaBucket, configFile),
})
if err != nil {
return err
}
}
return saveConfig(ctx, objAPI, configFile, data)
}
// data is optional. If nil it will be loaded from backend.
func readServerConfig(ctx context.Context, objAPI ObjectLayer, data []byte) (config.Config, error) {
srvCfg := config.New()
var err error
if len(data) == 0 {
configFile := path.Join(minioConfigPrefix, minioConfigFile)
data, err = readConfig(ctx, objAPI, configFile)
if err != nil {
if errors.Is(err, errConfigNotFound) {
lookupConfigs(srvCfg, objAPI)
}
return nil, err
}
data, err = decryptData(data, configFile)
if err != nil {
lookupConfigs(srvCfg, objAPI)
return nil, err
}
}
json := jsoniter.ConfigCompatibleWithStandardLibrary
if err := json.Unmarshal(data, &srvCfg); err != nil {
return nil, err
}
// Add any missing entries
return srvCfg.Merge(), nil
}
// ConfigSys - config system.
type ConfigSys struct{}
// Init - initializes config system from config.json.
func (sys *ConfigSys) Init(objAPI ObjectLayer) error {
if objAPI == nil {
return errInvalidArgument
}
return initConfig(objAPI)
}
// NewConfigSys - creates new config system object.
func NewConfigSys() *ConfigSys {
return &ConfigSys{}
}
// Initialize and load config from remote etcd or local config directory
func initConfig(objAPI ObjectLayer) (err error) {
bootstrapTrace("load the configuration")
defer func() {
if err != nil {
bootstrapTrace(fmt.Sprintf("loading configuration failed: %v", err))
}
}()
if objAPI == nil {
return errServerNotInitialized
}
srvCfg, err := readConfigWithoutMigrate(GlobalContext, objAPI)
if err != nil {
return err
}
bootstrapTrace("lookup the configuration")
// Override any values from ENVs.
lookupConfigs(srvCfg, objAPI)
// hold the mutex lock before a new config is assigned.
globalServerConfigMu.Lock()
globalServerConfig = srvCfg
globalServerConfigMu.Unlock()
return nil
}